Image forming apparatus including registration roller locking de

Details Image forming apparatus including registration roller locking de Image forming apparatus including registration roller locking de

1996-07-26

1998-06-09

Beatty, Robert

Electrophotography

Document handling

Copy

399384, 399395, 271242, G03G 1500

Patent

active

057650926

ABSTRACT:
An image forming apparatus improved so that the leading end of a sheet can be exactly stopped in a nip position of registration rollers, and an image transferred to the sheet is not shifted. A locking device is provided in relation to the registration rollers provided in a conveying path. When the leading end of a cut sheet is inserted into the conveying path and is fed to the registration rollers, the registration rollers are brought into a state where it cannot be rotated by the locking device. Therefore, the leading end of the cut sheet fed is reliably stopped in the nip position of the registration rollers, and cannot enter the conveying path beyond this position. The conveyance of the cut sheet is thereafter resumed by the registration rollers and reaches a downstream pair of conveying rollers where the sheet is subjected to so-called secondary sheet feeding to an image forming section. At the same time, the locking device is turned off, whereby a load of the locking device is not applied to the registration rollers so that the registration rollers are freely rotated smoothly. When the trailing end of the cut sheet separates from the registration rollers, therefore, the cut sheet is not vibrated.

REFERENCES:
patent: 3960446 (1976-06-01), Ogawa et al.
patent: 4337935 (1982-07-01), Sawada et al.
patent: 4392740 (1983-07-01), Ito et al.
patent: 4436406 (1984-03-01), Murasaki et al.
patent: 4740817 (1988-04-01), Suzuki et al.
patent: 5296906 (1994-03-01), Hano et al.
patent: 5347349 (1994-09-01), Sato et al.

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